package com.example.server.utils;

import org.csource.fastdfs.*;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.core.io.ClassPathResource;
import org.springframework.web.multipart.MultipartFile;
import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;

/*
* FastDFS工具类
* */
public class FastDFSUtils {

    private static Logger logger = LoggerFactory.getLogger(FastDFSUtils.class);

    static {

        /*
        * 初始化客户端
        * ClientGlobal.inti 读取配置文件，并初始化对应的属性
        * */
        try {
            String filePath = new ClassPathResource("fdfs_client.conf").getFile().getAbsolutePath();
            ClientGlobal.init(filePath);
        } catch (Exception e) {
            logger.error("初始化FastDFS失败",e.getMessage());
        }

    }


    public static String[] upload(MultipartFile file) {
        String name = file.getOriginalFilename();
        logger.info("文件名：", name);
        StorageClient storageClient = null;
        String[] uploadResults = null;
        try {
            //获取storage客户端
            storageClient = getStorageClient();
            //上传
            uploadResults = storageClient.upload_file(file.getBytes(), name.substring(name.lastIndexOf(".") + 1), null);
        } catch (Exception e) {
            logger.error("上传文件失败", e.getMessage());
        }
        if (null == uploadResults) {
            logger.error("上传失败", storageClient.getErrorCode());
        }
        return uploadResults;
    }

    /*
    * 获取文件信息
    * */
    public static FileInfo getFileInfo(String groupName, String remoteFileName){
        StorageClient storageClient = null;
        try {
            storageClient = getStorageClient();
            return storageClient.get_file_info(groupName,remoteFileName);
        } catch (Exception e) {
            logger.error("文件信息获取失败",e.getMessage());
        }
        return null;
    }

    /*
    * 下载文件
    * */
    public static InputStream downFile(String groupName,String remoteFileName){
        StorageClient storageClient = null;
        try {
            storageClient = getStorageClient();
            byte[] fileByte = storageClient.download_file(groupName,remoteFileName);
            InputStream inputStream = new ByteArrayInputStream(fileByte);
            return inputStream;
        } catch (Exception e) {
            logger.error("文件下载失败",e.getMessage());
        }
        return null;
    }

    /*
    * 删除文件
    * */
    public static void deleteFile(String groupName, String remoteFileName){
        StorageClient storageClient = null;
        try {
            storageClient = getStorageClient();
            storageClient.delete_file(groupName,remoteFileName);
        } catch (Exception e) {
            logger.error("文件删除失败",e.getMessage());
        }
    }

    /*
    * 生成storage客户端
    * */
    private static StorageClient getStorageClient() throws IOException{
        TrackerServer trackServer = getTrackerServer();
         StorageClient storageClient = new StorageClient(trackServer, null);
        return storageClient;
    }


    /*
    * 生成tracker服务器
    * */

    private static TrackerServer getTrackerServer() throws IOException{
        TrackerClient trackerClient = new TrackerClient();
        TrackerServer trackerServer = trackerClient.getTrackerServer();
        return trackerServer;
    }

    /*
    * 获取文件路劲
    * */

    public static String getTrackerUrl(){
        TrackerClient trackerClient = new TrackerClient();
        TrackerServer trackerServer = null;
        StorageServer storageServer = null;
        try {
            trackerServer = trackerClient.getTrackerServer();
            storageServer = trackerClient.getStoreStorage(trackerServer);
        }catch (Exception e){
            logger.error("文件路径获取失败",e.getMessage());
        }
        return "http://"+storageServer.getInetSocketAddress().getHostString()+":8888/";
    }

}
